$\lim_{x\to\infty}\left(x^4\cdot e^{-x}\right)$
$\frac{dy}{dx}=\frac{4}{\sqrt{1-16x^2}}$
$7\cdot81$
$\int\left(3x^3\right)\left(-2x^2+5x\right)dx$
$\frac{d}{dx}.005x^3+.04x^2+.7x$
$\frac{15x^4y^{-2}}{3x^2y^3}$
$25b^2\:-\:4b\:+\:16$
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